DLLADouble Leading Logarithmic Approximation
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In this paper, we exploit MMV model and CCS method for DLLA 3D SAR imaging at azimuth and cross-track direction.
Section 2 formulates the signal model of DLLA 3D SAR.
The imaging geometry of DLLA 3D SAR using linear array is shown in Figure 1.
In DLLA 3D SAR imaging, there are large amounts of nontarget zones in the different elevations of the 3D scene, which renders the signals sparse on the azimuth and cross-track plane [28].
To satisfy unambiguous imaging conditions of DLLA 3D SAR imaging, the beam width is limited by [absolute value of ([theta])] [less than or equal to] 15[degrees] [7], which is the subset of [theta] [member of] [-[pi]/6, [pi]/6].
The basis flowchart of DLLA 3D SAR imaging with MMV model in azimuth direction and CCS in cross-track direction is shown in Figure 2.
PDLL[A.sub.x] copolymers possessed intriguing structure/properties correlation, where tensile behaviors were strongly dependent on DLLA content (7).
Thermal properties of the spun fibers of PDLL[A.sub.x] with different DLLA contents were examined in comparison with the corresponding solution-cast film samples, where the DSC thermograms (first heating scan) are shown in Fig.
XRD traces of as-spun fiber mats prepared from CH[Cl.sub.3] and the mixed solvent, as a function of DLLA content, are compared in Figs.
Enhancement in bulk modulus, strength, and elongation at break, with increasing DLLA contents, is obtained in semicrystalline copolymer films.
Effect of the copolymer structure, that is, the DLLA content, on mechanical properties is different from that of the film samples, due to the competing effect of the fiber structure and interplay between intra-/ intermolecular hydrogen bonding.
Mechanical properties of PDLL[A.sub.X] copolymers in the forms of as-cast film and fiber mats, as a function of DLLA contents.